1 #ifndef _LINUX_TIMER_H
2 #define _LINUX_TIMER_H
3
4 #include <linux/list.h>
5 #include <linux/ktime.h>
6 #include <linux/stddef.h>
7 #include <linux/debugobjects.h>
8 #include <linux/stringify.h>
9
10 struct tvec_base;
11
12 struct timer_list {
13 struct list_head entry;
14 unsigned long expires;
15
16 void (*function)(unsigned long);
17 unsigned long data;
18
19 struct tvec_base *base;
20 #ifdef CONFIG_TIMER_STATS
21 void *start_site;
22 char start_comm[16];
23 int start_pid;
24 #endif
25 #ifdef CONFIG_LOCKDEP
26 struct lockdep_map lockdep_map;
27 #endif
28 };
29
30 extern struct tvec_base boot_tvec_bases;
31
32 #ifdef CONFIG_LOCKDEP
33 /*
34 * NB: because we have to copy the lockdep_map, setting the lockdep_map key
35 * (second argument) here is required, otherwise it could be initialised to
36 * the copy of the lockdep_map later! We use the pointer to and the string
37 * "<file>:<line>" as the key resp. the name of the lockdep_map.
38 */
39 #define __TIMER_LOCKDEP_MAP_INITIALIZER(_kn) \
40 .lockdep_map = STATIC_LOCKDEP_MAP_INIT(_kn, &_kn),
41 #else
42 #define __TIMER_LOCKDEP_MAP_INITIALIZER(_kn)
43 #endif
44
45 #define TIMER_INITIALIZER(_function, _expires, _data) { \
46 .entry = { .prev = TIMER_ENTRY_STATIC }, \
47 .function = (_function), \
48 .expires = (_expires), \
49 .data = (_data), \
50 .base = &boot_tvec_bases, \
51 __TIMER_LOCKDEP_MAP_INITIALIZER( \
52 __FILE__ ":" __stringify(__LINE__)) \
53 }
54
55 #define DEFINE_TIMER(_name, _function, _expires, _data) \
56 struct timer_list _name = \
57 TIMER_INITIALIZER(_function, _expires, _data)
58
59 void init_timer_key(struct timer_list *timer,
60 const char *name,
61 struct lock_class_key *key);
62 void init_timer_deferrable_key(struct timer_list *timer,
63 const char *name,
64 struct lock_class_key *key);
65
66 #ifdef CONFIG_LOCKDEP
67 #define init_timer(timer) \
68 do { \
69 static struct lock_class_key __key; \
70 init_timer_key((timer), #timer, &__key); \
71 } while (0)
72
73 #define init_timer_deferrable(timer) \
74 do { \
75 static struct lock_class_key __key; \
76 init_timer_deferrable_key((timer), #timer, &__key); \
77 } while (0)
78
79 #define init_timer_on_stack(timer) \
80 do { \
81 static struct lock_class_key __key; \
82 init_timer_on_stack_key((timer), #timer, &__key); \
83 } while (0)
84
85 #define setup_timer(timer, fn, data) \
86 do { \
87 static struct lock_class_key __key; \
88 setup_timer_key((timer), #timer, &__key, (fn), (data));\
89 } while (0)
90
91 #define setup_timer_on_stack(timer, fn, data) \
92 do { \
93 static struct lock_class_key __key; \
94 setup_timer_on_stack_key((timer), #timer, &__key, \
95 (fn), (data)); \
96 } while (0)
97 #else
98 #define init_timer(timer)\
99 init_timer_key((timer), NULL, NULL)
100 #define init_timer_deferrable(timer)\
101 init_timer_deferrable_key((timer), NULL, NULL)
102 #define init_timer_on_stack(timer)\
103 init_timer_on_stack_key((timer), NULL, NULL)
104 #define setup_timer(timer, fn, data)\
105 setup_timer_key((timer), NULL, NULL, (fn), (data))
106 #define setup_timer_on_stack(timer, fn, data)\
107 setup_timer_on_stack_key((timer), NULL, NULL, (fn), (data))
108 #endif
109
110 #ifdef CONFIG_DEBUG_OBJECTS_TIMERS
111 extern void init_timer_on_stack_key(struct timer_list *timer,
112 const char *name,
113 struct lock_class_key *key);
114 extern void destroy_timer_on_stack(struct timer_list *timer);
115 #else
116 static inline void destroy_timer_on_stack(struct timer_list *timer) { }
117 static inline void init_timer_on_stack_key(struct timer_list *timer,
118 const char *name,
119 struct lock_class_key *key)
120 {
121 init_timer_key(timer, name, key);
122 }
123 #endif
124
125 static inline void setup_timer_key(struct timer_list * timer,
126 const char *name,
127 struct lock_class_key *key,
128 void (*function)(unsigned long),
129 unsigned long data)
130 {
131 timer->function = function;
132 timer->data = data;
133 init_timer_key(timer, name, key);
134 }
135
136 static inline void setup_timer_on_stack_key(struct timer_list *timer,
137 const char *name,
138 struct lock_class_key *key,
139 void (*function)(unsigned long),
140 unsigned long data)
141 {
142 timer->function = function;
143 timer->data = data;
144 init_timer_on_stack_key(timer, name, key);
145 }
146
147 /**
148 * timer_pending - is a timer pending?
149 * @timer: the timer in question
150 *
151 * timer_pending will tell whether a given timer is currently pending,
152 * or not. Callers must ensure serialization wrt. other operations done
153 * to this timer, eg. interrupt contexts, or other CPUs on SMP.
154 *
155 * return value: 1 if the timer is pending, 0 if not.
156 */
157 static inline int timer_pending(const struct timer_list * timer)
158 {
159 return timer->entry.next != NULL;
160 }
161
162 extern void add_timer_on(struct timer_list *timer, int cpu);
163 extern int del_timer(struct timer_list * timer);
164 extern int mod_timer(struct timer_list *timer, unsigned long expires);
165 extern int mod_timer_pending(struct timer_list *timer, unsigned long expires);
166 extern int mod_timer_pinned(struct timer_list *timer, unsigned long expires);
167
168 #define TIMER_NOT_PINNED 0
169 #define TIMER_PINNED 1
170 /*
171 * The jiffies value which is added to now, when there is no timer
172 * in the timer wheel:
173 */
174 #define NEXT_TIMER_MAX_DELTA ((1UL << 30) - 1)
175
176 /*
177 * Return when the next timer-wheel timeout occurs (in absolute jiffies),
178 * locks the timer base:
179 */
180 extern unsigned long next_timer_interrupt(void);
181 /*
182 * Return when the next timer-wheel timeout occurs (in absolute jiffies),
183 * locks the timer base and does the comparison against the given
184 * jiffie.
185 */
186 extern unsigned long get_next_timer_interrupt(unsigned long now);
187
188 /*
189 * Timer-statistics info:
190 */
191 #ifdef CONFIG_TIMER_STATS
192
193 extern int timer_stats_active;
194
195 #define TIMER_STATS_FLAG_DEFERRABLE 0x1
196
197 extern void init_timer_stats(void);
198
199 extern void timer_stats_update_stats(void *timer, pid_t pid, void *startf,
200 void *timerf, char *comm,
201 unsigned int timer_flag);
202
203 extern void __timer_stats_timer_set_start_info(struct timer_list *timer,
204 void *addr);
205
206 static inline void timer_stats_timer_set_start_info(struct timer_list *timer)
207 {
208 if (likely(!timer_stats_active))
209 return;
210 __timer_stats_timer_set_start_info(timer, __builtin_return_address(0));
211 }
212
213 static inline void timer_stats_timer_clear_start_info(struct timer_list *timer)
214 {
215 timer->start_site = NULL;
216 }
217 #else
218 static inline void init_timer_stats(void)
219 {
220 }
221
222 static inline void timer_stats_timer_set_start_info(struct timer_list *timer)
223 {
224 }
225
226 static inline void timer_stats_timer_clear_start_info(struct timer_list *timer)
227 {
228 }
229 #endif
230
231 extern void add_timer(struct timer_list *timer);
232
233 #ifdef CONFIG_SMP
234 extern int try_to_del_timer_sync(struct timer_list *timer);
235 extern int del_timer_sync(struct timer_list *timer);
236 #else
237 # define try_to_del_timer_sync(t) del_timer(t)
238 # define del_timer_sync(t) del_timer(t)
239 #endif
240
241 #define del_singleshot_timer_sync(t) del_timer_sync(t)
242
243 extern void init_timers(void);
244 extern void run_local_timers(void);
245 struct hrtimer;
246 extern enum hrtimer_restart it_real_fn(struct hrtimer *);
247
248 unsigned long __round_jiffies(unsigned long j, int cpu);
249 unsigned long __round_jiffies_relative(unsigned long j, int cpu);
250 unsigned long round_jiffies(unsigned long j);
251 unsigned long round_jiffies_relative(unsigned long j);
252
253 unsigned long __round_jiffies_up(unsigned long j, int cpu);
254 unsigned long __round_jiffies_up_relative(unsigned long j, int cpu);
255 unsigned long round_jiffies_up(unsigned long j);
256 unsigned long round_jiffies_up_relative(unsigned long j);
257
258 #endif
259
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